If transaminase is elevated after chemotherapy for breast cancer, according to the different degree of elevation, the treatment plan of continuing chemotherapy and using liver-protecting drugs or stopping chemotherapy and using two or more liver-protecting drugs will be adopted respectively. Elevated aminotransferase after chemotherapy for breast cancer is mainly due to liver damage caused by drugs, according to the different degree of damage, the following treatments will be adopted respectively. 1. If the value of elevated transaminases is within two times of the normal value, you can generally consider continuing chemotherapy, and at the same time choose liver-protecting drugs such as glutathione and diammonium glycyrrhizinate to reduce the level of transaminases. 2. If the elevation of aminotransferase is more than twice the normal value, it is necessary to stop chemotherapy, choose two or three liver-protecting drugs to reduce aminotransferase, and improve chemotherapy as soon as possible after the liver function improves. It is recommended that the patient consult the doctor in time, actively cooperate with the doctor’s treatment, and regularly monitor the liver function during the period of medication, so as to avoid delaying the condition.